#3. Model updates are almost a free lunchJust the last ~6 months, the upgrade from OpenAI GPT-4.1 to GPT-5.1 (let’s not mention the dreadful GPT-5) was night and day: better answers, more reliable tool calls, faster responses, less processing errors, better schema output. You can see similar patterns for the Opus 4.5 to Opus 4.6 and the Gemini upgrades.
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
从宏观层面来说，S26 Ultra 让屏幕实现大角度防窥的原理并不复杂：控制光线角度。。PDF资料是该领域的重要参考
need to shut down, and the factories that turned their pellets into。新收录的资料对此有专业解读
at least five characters，这一点在新收录的资料中也有详细论述
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